WO2013099809A1 - Vehicle rear spoiler device - Google Patents

Description

Rear spoiler device for vehicle

The present invention relates to a rear spoiler device for a vehicle, and more particularly to a rear spoiler device having a function to prevent adhesion of water droplets and the like to a rear window glass.

Conventionally, various devices have been proposed as rear spoiler devices for vehicles. For example, Patent Document 1 describes a rear spoiler device for a vehicle configured to form an air flow path having a smaller outflow width than the inflow width with a rear window glass provided at the rear of the vehicle. According to this, the width of the air flow path between the vehicle rear spoiler device and the rear window glass is gradually narrowed to increase the speed (flow velocity) of the air flow passing through the air flow path, and It is directed to the rear rear window glass. Water droplets and the like adhering to the rear window glass are blown away by the air flow at which the flow velocity is increased. Alternatively, the air curtain effect makes it difficult for water droplets to adhere. For this reason, the cleaning effect of rear window glass is exhibited (for example, refer to patent documents 1).

Unexamined-Japanese-Patent No. 2002-2553

However, in the rear spoiler apparatus for vehicles of patent document 1, in order to improve the cleaning effect, it is necessary to make the flow velocity of air flow faster, and this will cause the increase in air resistance. Further, the negative pressure at the rear surface of the vehicle is increased by deriving the air flow having a high flow velocity. When the negative pressure becomes large, the air flow from the side of the vehicle becomes large, and there is a possibility that water droplets and the like may adhere to the rear window glass.

The present invention has been made in view of the above problems, and has an object to suppress an increase in air resistance and to reduce negative pressure on the rear surface of the vehicle.

According to a first aspect of the present invention, there is provided a wall surface which forms an air flow path through which a part of air flow moving rearward along a roof surface of a vehicle passes as a downward flow between the vehicle and a rear portion of the vehicle; An outlet side end formed at an outlet of the air flow passage in the wall surface; and an inlet side end formed at an inlet of the air flow passage in the wall surface; For a vehicle, the outflow width being the distance between the wall surface and the rear part of the vehicle being greater than the inflow width being the distance between the wall surface at the inlet end and the rear part of the vehicle It is a structure of a rear spoiler apparatus. In this case, the wall surface may be formed to gradually widen the air flow passage such that the outflow width of the air flow passage is larger than the inflow width of the air flow passage.

Here, "to gradually widen" does not mean to gradually widen the air flow passage from the inlet to the entire outlet, but the wall surface so that part of the air flow passage gradually widens. Shall also include those in which Also, "the rear part of the vehicle" generally refers to the rear part of the vehicle body, which includes the rear window glass and the rear part of the roof.

With the same configuration, in the vehicle rear spoiler device, the width of the air flow passage formed between the vehicle rear spoiler device and the rear window glass (rear portion of the vehicle) is gradually widened from the inlet to the outlet to By increasing the negative pressure, air can be easily taken into the air flow path without causing an increase in air resistance. As a result, much of the air taken in can be directed to the rear window glass, the negative pressure on the rear face of the vehicle can be reduced, and the adhesion of water droplets and the like due to air flow entrainment and entrainment from the side of the vehicle can be suppressed. The effect can be improved.

A second problem solving means of the present invention is configured such that the ratio of the inflow width to the outflow width is a ratio that causes the downward flow in the air flow passage to have a diffuser effect.

According to the same configuration, it is possible to provide a rear spoiler device for a vehicle, which causes a diffuser effect in the downward flow in the air flow path, easily takes in air, and reduces negative pressure on the rear surface of the vehicle.

A third problem solving means of the present invention is configured such that the ratio of the inflow width to the outflow width is approximately 11:14.

With this configuration, it is possible to more reliably form, in the air flow path, an air flow that can suppress the increase in air resistance and reduce the negative pressure on the rear surface of the vehicle.

The fourth problem solution means of the present invention is configured to have an upper surface for branching the air flow separately from the downward flow and moving it backward, and the upper surface is gradually lower than the roof surface toward the rear. It is.

With this configuration, a branched air flow separate from the downflow flows toward the rear of the vehicle along the upper surface which becomes gradually lower than the roof surface. Thus, the air flow can flow downward of the vehicle, and the negative pressure on the rear surface of the vehicle can be reduced.

Further, according to a fifth problem solving means of the present invention, the wall surface is a groove which is inclined in the vehicle longitudinal direction with respect to the vehicle width direction, and one end extends toward the vehicle rear end of the wall surface It is the structure in which the guide part which has a protrusion is formed.

According to the same configuration, a guide portion having a groove or a ridge is formed on the wall surface of the rear spoiler device for a vehicle. Therefore, when water droplets flow into the air flow passage and adhere to the wall surface of the rear spoiler device for a vehicle, all or a part of the attached water droplets move on the wall surface rearward by the air flow of the air flow passage. Enter the guidance section. The water droplet which has entered the guiding portion flows on the wall along the guiding portion so as to be guided by the guiding portion. Here, since the guide portion is inclined in the longitudinal direction of the vehicle with respect to the vehicle width direction, the water droplet traveling along the guide portion is moved toward the vehicle rear side as it rides on the air flow in the air flow passage. The position in the vehicle width direction at the top changes. Then, the water droplets flow downward from one end of the guide portion. Further, when the guide portion extends to the vehicle rear end of the wall surface, the water droplets transmitted along the guide portion are finally guided to a position where one end portion of the guide portion is formed in the vehicle rear end of the wall surface Ru. Then, it flows downward from there and adheres to the rear window glass.

That is, according to the same configuration, it is possible to adjust the position where the water droplets attached to the wall surface of the rear spoiler device for a vehicle fall down by the position of one end of the guide portion formed of the groove or the ridge formed on the wall surface. it can. Therefore, even if water droplets flow into the air flow path, by adjusting the position of one end of the guiding portion so that the water droplets fall to a position that does not deteriorate the backward visibility through the rear window glass, It is possible to suppress the deterioration of the rear view due to water droplets flowing to the rear window glass.

The guide portion may be inclined in the longitudinal direction of the vehicle with respect to the vehicle width direction, and may be inclined in the vertical direction with respect to the vehicle width direction. According to this, it is possible to change the position of the water droplet on the wall surface in the vehicle width direction as the water droplet traveling along the guide portion is moved downward by the gravity or the air flow in the air flow channel. The wall surface may be inclined to face a rear window glass provided at the rear of the vehicle body. According to this, it is possible to form on the wall surface the guide portion inclined in the vehicle longitudinal direction and the vehicle vertical direction with respect to the vehicle width direction.

The position of one end of the guide in the vehicle width direction may be a position that does not deteriorate the rear view when water droplets fall from there on the rear window glass. For example, in the case of a vehicle equipped with a rear wiper, the position of one end of the guide portion in the vehicle width direction is set such that water droplets fall outside the vehicle width direction outside the wiping range of the rear window glass by the rear wiper It is good. In this case, the position in the vehicle width direction of one end of the guide portion may be a position separated by a predetermined distance from the central portion in the vehicle width direction of the wall surface of the vehicle rear spoiler device. Preferably, the position of one end of the guiding portion is 1/10 of the vehicle width direction length of the rear window glass so that the behavior of the following vehicle traveling in the same lane can be seen from the center in the vehicle width direction of the wall surface. It is better to be at a position spaced apart in the vehicle width direction by more than the length of. According to this, the water droplet which has reached the vehicle rear end of the wall surface along the guide portion falls to a position separated by a certain distance from the center of the rear window glass in the vehicle width direction. That is, water droplets fall on the rear window glass while avoiding the central portion in the vehicle width direction of the rear window glass. The rear view is deteriorated by the water droplets adhering to the vicinity of the central portion of the rear window glass, and thus the deterioration of the rear view can be suppressed by flowing the water droplets onto the rear window glass by avoiding the central portion.

The guide portion may be inclined in the vehicle longitudinal direction with respect to the vehicle width direction so as to go outward from the central portion in the vehicle width direction toward the vehicle rearward direction. According to this, the water droplet which has entered the guide portion is separated from the center portion of the wall surface in the vehicle width direction as it approaches the rear end of the vehicle. Therefore, when the rear end of the vehicle is reached, the position of the water droplet is considerably away from the central portion in the vehicle width direction. As described above, since the water droplets fall onto the rear window glass from a position considerably distant from the central portion, it is possible to more effectively suppress the deterioration of the rear view.

The other end of the guide may or may not extend to the vehicle rear end of the wall. Further, the guide portion may be formed to be inclined in a straight line, or may be formed to be inclined in a curvilinear shape. Furthermore, a plurality of guide portions may be formed on the wall surface of the vehicle rear spoiler device. In this case, it is preferable that a plurality of guide portions be formed so as to overlap in the vehicle longitudinal direction. Further, the depth of the groove in the case where the guide is a groove and the height of the ridge in the case where the guide is a protrusion need only be such that water droplets are induced along the guide, in particular The dimensions are not limited.

The present invention has been made in view of the above problems, and has an object to suppress an increase in air resistance and to reduce negative pressure on the rear surface of the vehicle.

FIG. 1 is a perspective view of a rear spoiler according to a first embodiment of the present invention as viewed from below. FIG. 2 is a view showing a cross-sectional view of FIG. 1A-A together with a cross-section of the rear of the vehicle body. FIG. 3 is a view showing the relationship between the set dimensions of the inlet and the outlet of the air flow passage, the Cd value, and the vehicle speed ratio. FIG. 4 is a schematic perspective view of a rear spoiler device for a vehicle according to a second embodiment. FIG. 5 is a front view of the rear spoiler device viewed from the front side of the vehicle. FIG. 6 is a bottom view of the rear spoiler device as viewed from below the vehicle. FIG. 6 is a schematic view showing a cross section BB of FIG. 5 together with a cross section of a rear portion of a vehicle body. FIG. 8 is a view showing a modification of the groove formed in the inner wall portion of the rear spoiler. FIG. 9 is a view showing another modification of the groove formed in the inner wall portion of the rear spoiler. FIG. 10 is a view showing another modification of the groove formed in the inner wall portion of the rear spoiler. FIG. 11 is a view showing another modification of the groove formed in the inner wall portion of the rear spoiler. FIG. 12 is a view showing another modification of the groove formed in the inner wall portion of the rear spoiler.

First Embodiment
Hereinafter, a first embodiment of the present invention will be described in detail based on the drawings.

FIG. 1 is a perspective view of a rear spoiler device 1 (a rear spoiler device for a vehicle) according to the present embodiment as viewed from below. The rear spoiler 2 is disposed behind the roof 4 of the vehicle 3 and is mounted for the purpose of improving the running stability of the vehicle 3, improving the fuel efficiency, and improving the design of the vehicle 3. The rear spoiler 2 extends over the whole of the vehicle 3 in the left-right direction (vehicle width direction), and mounting pieces 6 and 7 extending forward and diagonally downward are provided at left and right ends thereof. The rear spoiler 2 is attached to the upper end of the vehicle rear surface 8 by the attachment pieces 6 and 7. Further, an air flow passage 10 is formed between the rear spoiler 2 and the rear window glass 5 (the rear portion of the vehicle), and the air flow passage 10 is formed over the whole of the vehicle 3 in the left-right direction. The air passage 10 may be formed between the rear spoiler 2 and the upper end (rear portion of the vehicle) of the rear surface 8 of the vehicle. In addition, the air flow path 10 may be formed over the entire left-right direction (vehicle width direction) of the rear window glass 5, or may be formed in a part in the left-right direction of the vehicle.

FIG. 2 is a cross-sectional view of the vehicle 3 including the rear spoiler 2 taken along line AA in FIG. As shown in FIG. 2, the rear spoiler 2 includes an upper wall 11, a lower wall 12, and an inner wall 13. In detail, the rear spoiler 2 is provided with an inner wall portion 13 (wall surface) which forms an air flow path 10 with the rear window glass 5 in the vehicle 3. The inner wall portion 13 faces the rear end 4 a of the roof 4, the vehicle rear surface 8 and the rear window glass 5 and extends downward from the upper end 13 a thereof along these. The upper end 13a of the inner wall portion 13 is formed at a position higher than the roof 4 in the vertical direction, and is formed at a distance d from the reference plane F when the upper surface 4b (roof surface) of the roof 4 is the reference plane F. Ru. In addition, an upper wall portion 11 (upper surface) extending obliquely downward from the upper end 13a of the inner wall portion 13 toward the rear is formed. The upper wall portion 11 is formed to be inclined downward from the reference plane F of the roof 4 from the front end portion toward the rear end portion, and the inclination angle R between the reference plane F and the upper wall portion 11 is 10 It is an elevation angle of -13 °. In addition, a lower wall 12 extending obliquely upward from the lower end 13b of the inner wall 13 toward the rear is formed. The upper end 13a of the inner wall 13 may be formed on the reference plane F at the same height as the top surface 4b of the roof in the vertical direction.

In the air flow passage 10, an inlet 14 (inlet) into which air flows in and an outlet 15 (outlet) from which air flows out are formed. The inflow port 14 is formed between the upper end (inlet side end) 13 a of the inner wall 13 and the rear end 4 a of the roof 4 at a distance L 1 (inflow width). That is, the inflow port 14 is formed on the roof 4 side of the air flow path 10. Further, the outlet 15 is formed between the lower end (outlet side end) 13 b of the inner wall portion 13 and the rear window glass 5 at a distance L 2 (outlet width). The outflow port 15 may be formed between the lower end 13 b of the inner wall 13 and the vehicle rear surface 8. That is, the outflow port 15 is formed on the rear window glass 5 side of the air flow path 10. The inner wall portion 13 is provided to gradually widen the air flow passage 10 such that the distance L2 (outflow width) of the outflow port 15 becomes larger than the distance L1 (inflow width) of the inflow port 14. In detail, the inner wall portion 13 extends in such a manner that the distance L with the rear end 4a of the roof 4 or the rear window glass 5 gradually increases as it goes downward (backward). The inner wall portion 13 may have a shape in which the distance L is constant from the upper end 13a downward (backward).

Further, as the vehicle 3 travels, an air flow toward the rear is generated around the vehicle 3. At this time, an air flow AF1 moving rearward along the upper surface 4b of the roof 4 is formed on the roof 4. Then, a part of the air flow AF1 flows into the air flow path 10 from the inflow port 14, and becomes an air flow AF2 (downflow) that flows through the air flow path 10 and flows out of the flow outlet 15. That is, the air flow AF2 is a downward flow passing through the air flow path 10 and toward the rear window glass 5. Further, the upper wall portion 11 forms an air flow AF3 which branches the air flow AF1 separately from the air flow AF2 and moves the air flow AF1 to the rear of the vehicle 3. Then, the air flow AF3 flows along the upper wall portion 11 and flows downward of the vehicle 3 behind the rear end 11a of the upper wall portion 11.

FIG. 3 shows the relationship between the set dimensions of the distance L1 of the inlet 14 and the distance L2 of the outlet 15 in the air flow passage 10, the Cd value, and the vehicle speed ratio (the ratio of the vehicle speed to the air velocity AF2). The range A is a range of the distance L1 of the inlet 14 and the distance L2 of the outlet 15 in which the Cd value in the traveling of the vehicle 3 tends to be low. That is, when the distance L1 is small, the distance d is also small, and the area in which the inner wall 13 collides with the air flow AF1 is small, so the air resistance (Cd value) is low. The range B is a range of the distance L1 of the inlet 14 and the distance L2 of the outlet 15 in which the air flow AF2 can reduce the adhesion of water droplets on the rear window glass 5 in the vehicle speed ratio. That is, water droplets and the like attached to the rear window glass 5 are blown away by the air flow AF2 to show the ranges of the distances L1 and L2 at which the air curtain effect can be obtained. The range C is a range in which the range A and the range B overlap. That is, the range of the distance L1 of the inflow port 14 and the distance L2 of the outflow port 15 capable of preventing the adhesion of water droplets to the rear window glass 5 as the Cd value becomes low is shown. In the area C, the ratio of the distance L1 to the distance L2 is preferably 11:14. In area C, the ratio between the distance L1 and the distance L2 may not be exactly 11:14.

The air flow generated by the traveling of the vehicle 3 will be described.

The air flows shown in FIG. 2 are air flows AF1, AF2, and AF3 generated around the vehicle 3 and the rear spoiler device 1. The air flow AF1 occurs above the upper surface 4b of the roof 4 and the upper wall 11 of the rear spoiler 2 and flows along the upper surface 4b of the roof 4 and the upper wall 11 to the rear of the vehicle 3. The air flow AF2 is branched from a part of the air flow AF1 and flows into the air flow path 10 from the inflow port 14, passes through the air flow path 10, flows out from the outflow port 15, and flows downward along the rear window glass 5. In the air flow AF3, a part of the air flow AF1 flowing above the upper wall portion 11 flows backward along the upper wall portion 11, flows backward rearward from the rear end 11a of the upper wall portion 11, and flows obliquely downward. .

Further, since the air flow path 10 has a structure in which the distance L gradually increases in order to increase the air flow path 10 from the inflow port 14 toward the outflow port 15, the air pressure in the air flow path 10 is increased by the diffuser effect. It becomes higher gradually, and the air flow AF2 flows vigorously from the outlet 15. Then, the air flow AF2 in the air flow path 10 flows more smoothly, the negative pressure in the air flow path 10 increases, and more air around the roof 4 and the rear spoiler 2 is taken into the air flow path 10 from the inflow port 14 Be A large amount of air can then flow along the rear window glass 5 to the rear of the vehicle.

As described above, according to this embodiment, the following effects can be obtained.

(1) In the rear spoiler device 1, the distance L of the air flow passage 10 formed between the rear spoiler 2 and the rear window glass 5 is gradually increased from the inflow port 14 to the outflow port 15. By increasing the pressure, air can be easily taken into the air passage 10 without causing an increase in air resistance. As a result, much air taken in can be directed to the rear window glass 5, and the negative pressure on the rear surface 8 of the vehicle can be reduced, so that adhesion of water droplets and the like due to wind entrainment and entrainment from the side of the vehicle can be suppressed. The effect can be improved. Further, since the negative pressure can be reduced, the pressure resistance due to the air applied to the vehicle 3 can be reduced. This can also improve the fuel consumption of the vehicle.

(2) By causing the air flow AF2 in the air flow passage 10 to have a diffuser effect, it is possible to provide the rear spoiler device 1 which can easily take in air and reduce the negative pressure of the rear surface 8 of the vehicle.

(3) The air flow AF2 can be more reliably formed in the air flow path 10, which can reduce the negative pressure on the rear surface 8 of the vehicle by suppressing the increase in air resistance.

(4) Along the upper wall portion 11 which becomes gradually lower than the upper surface 4b of the roof 4, a branched air flow AF3 separate from the air flow AF2 flows rearward of the vehicle 3. As a result, the air flow AF3 flows downward of the vehicle 3, the negative pressure behind the vehicle 3 can be reduced, and the cleaning effect can be improved.

(5) Since the air flow path 10 is gradually expanded, the air pressure in the air flow path 10 gradually increases due to the diffuser effect, and the air flows out vigorously from the outlet port 15 of the air flow path 10. Then, the air flow AF2 in the air flow path 10 flows more smoothly, and the negative pressure increases. Thus, more air around the roof 4 and the rear spoiler 2 can be taken into the air flow path 10 from the inflow port 14. That is, the distance d from the upper end 13a of the inner wall 13 to the reference surface F of the top surface 4b of the roof 4 can be further reduced, and the air resistance applied to the vehicle 3 can be reduced.

Second Embodiment
Next, a second embodiment of the present invention will be described. 4 is a schematic perspective view of the rear spoiler device 20 according to the present embodiment, FIG. 5 is a front view of the rear spoiler device 20, and FIG. 6 is a bottom view of the rear spoiler device 20. 7 is a view showing a cross section taken along the line BB in FIG. 5 together with a cross section of the rear portion of the vehicle body. The directions shown by the arrows in FIGS. 4 to 7 are directions viewed from the vehicle when the rear spoiler device 20 is mounted on the vehicle. The rear spoiler device 20 according to the present embodiment is also installed on the rear side of the roof of the vehicle, similarly to the rear spoiler device 1 of the first embodiment. The rear spoiler device 20 has a rear spoiler 21 and a pair of legs 22 and 22 as shown in FIGS. 4 to 6. The rear spoiler 21 is formed in a long shape. The legs 22, 22 project from near both ends of the rear spoiler 21 in the longitudinal direction. The tip end portions of the legs 22 and 22 are a rear portion of the vehicle body and fixed to an upper portion of a rear window glass. The state in which the rear spoiler device 20 is mounted on the vehicle is the same as in FIG. 1 shown in the first embodiment, and the rear spoiler 21 is mounted on the vehicle so as to project rearward on the vehicle across the vehicle width direction (left and right direction). Be

As shown in FIG. 7, an air flow passage 30 is formed between the rear spoiler 21 and the rear window glass 25 (rear portion of the vehicle). The air flow passage 30 is formed over the entire vehicle width direction. The air passage 30 may be formed between the rear spoiler 21 and the rear surface (rear portion of the vehicle) 28 of the vehicle. Further, the air flow path 30 may be formed over the entire left and right direction (vehicle width direction) of the rear window glass 25 or may be formed in a part in the left and right direction of the vehicle.

The rear spoiler 21 has an upper wall portion 211, a lower wall portion 212, and an inner wall portion (wall surface) 213. An air flow passage 30 is formed between the inner wall portion 213 and the rear window glass 25 (or the vehicle rear surface 28). As shown in FIG. 7, the inner wall portion 213 has an upper end (vehicle front end) 213a and a lower end (vehicle rear end) 213b, and is formed in an elongated shape along the vehicle width direction. The upper end 213a corresponds to the inlet end in the first embodiment, and the lower end 213b corresponds to the outlet end in the first embodiment. The inner wall portion 213 is directed downward so as to face the rear end 4a of the roof 4 of the vehicle body V, the vehicle rear surface 28 and the rear window glass 25, and the lower end from the upper end (vehicle front end) 213a. It extends downward and rearward toward the side end (vehicle rear end) 213b. The upper end 213 a of the inner wall portion 213 is formed at a position higher by a distance d than the upper surface (roof surface) of the roof 4. Further, the upper wall portion 211 is formed on the vehicle rear side from the upper end (vehicle front end) 213a of the inner wall portion 213, is positioned above the inner wall portion 213, and faces upward. The upper wall portion 211 is inclined downward as it goes from the upper end (vehicle front end) 213a of the inner wall portion 213 to the rear of the vehicle. Further, a lower wall portion 212 is formed to extend from the lower end (vehicle rear end) 213b of the inner wall portion 213 to the vehicle rear side. The lower wall portion 212 is formed to extend obliquely upward as it goes rearward.

The air flow path 30 includes an inlet 31 (inlet) for causing part of the air flow moving backward along the roof 4 (roof surface) while the vehicle is traveling to flow into the air flow path 30, and an air flow path An outlet 32 (outlet) is formed to allow air to flow out of 30. The inflow port 31 is formed between the upper end 213 a of the inner wall portion 213 and the rear end 4 a of the roof 4, that is, on the roof 4 side which is the upper end side of the air flow path 30. The length of the inflow port 31 viewed from the vehicle width direction (direction perpendicular to the sheet in FIG. 7), that is, the distance viewed from the vehicle width direction between the upper end 213a of the inner wall 213 and the rear end 4a of the roof 4 The (inflow width) is indicated by L1 in FIG. Further, the outflow port 32 is formed between the lower end 213 b of the inner wall portion 213 and the rear window glass 25, that is, on the side of the rear window glass 25 which is the lower end side of the air flow passage 30. The length of the outlet 32 viewed from the vehicle width direction, that is, the shortest distance (outflow width) viewed from the vehicle width direction between the lower end 213b of the inner wall 213 and the rear window glass 25 is L2 in FIG. Indicated. The outlet 32 may be formed between the lower end 213 b of the inner wall 213 and the vehicle rear surface 28.

Also in the present embodiment, the distance L2 (outflow width) of the outflow port 32 is larger than the distance L1 (inflow width) of the inflow port 31 as in the first embodiment. In addition, the flow passage width of the air flow passage 30 (length L when viewed from the vehicle width direction) gradually increases from the inflow port 31 side toward the outflow port 32 side, that is, the flow path cross-sectional area gradually increases It is supposed to be. In other words, the distance L2 (outflow width) of the outflow port 32 is larger than the distance L1 (inflow width) of the inflow port 31, and the flow path width of the air flow path 30 from the inflow port 31 side toward the outflow port 32 side. The shape of the inner wall portion 213 of the rear spoiler 21 is determined such that (the length L viewed from the vehicle width direction) gradually increases, that is, the flow passage cross-sectional area gradually increases. In detail, the inner wall portion 213 is rearward and downward of the vehicle so that the distance L seen from the vehicle width direction to the vehicle rear surface 28 or the rear window glass 25 gradually increases from the upper end 213a downward. It is extended to The inner wall portion 213 may have a shape in which the distance L is constant at a part thereof.

Further, as shown in FIG. 4 to FIG. 7, a groove (guide portion) 29 is formed in the inner wall portion 213. In the present embodiment, the groove 29 is formed in an arc shape which is convex toward the upper side and the front side of the vehicle, as is well understood from FIGS. 5 and 6, and one end 29a and the other end 29b are inner walls. It extends to the lower end (vehicle rear end) 213 b of the portion 213. Further, as shown in FIG. 7, the lower wall 212 formed from the lower end (vehicle rear end) 213 b of the inner wall 213 toward the vehicle rear side is inclined upward toward the vehicle rear side. Therefore, the lower end (vehicle rear end) 213b of the inner wall portion 213 is formed to project downward.

As shown in FIGS. 4 and 6, the groove 29 is inclined in the vehicle longitudinal direction with respect to the vehicle width direction. Specifically, left groove portion 29L, which is a portion between groove portion 29 located at the central portion of inner wall portion 213 in the vehicle width direction of inner wall portion 213, to one end portion 29a It is inclined to the lower left side (vehicle rear side) in FIG. 6 with respect to the vehicle width direction so as to go outward from the center portion in the vehicle width direction as it heads. On the other hand, right groove portion 29R, which is a portion between portion O and the other end 29b, is directed in the vehicle width direction toward the outside from the center portion in the vehicle width direction from portion O toward the vehicle rear side. In FIG. 6, it inclines to the lower right side (vehicle rear side).

Further, as shown in FIGS. 4 and 5, the groove 29 is also inclined in the vertical direction with respect to the vehicle width direction. Specifically, the left groove portion 29L of the groove 29 is directed downward toward the left in FIG. 5 with respect to the vehicle width direction so that the left groove portion 29L proceeds outward from the center portion in the vehicle width direction from the portion O toward the vehicle lower side. Inclined to). On the other hand, the right groove portion 29R is inclined downward to the right in FIG. 5 with respect to the vehicle width direction so as to go outward from the central portion in the vehicle width direction from the portion O toward the vehicle lower side.

Further, the positions of one end 29 a and the other end 29 b of the groove 29 in the vehicle width direction are positions separated by a predetermined distance from the center in the vehicle width direction of the inner wall 213 of the rear spoiler 21. Specifically, one end portion 29a is about 1/3 of the entire length (length in the vehicle width direction) of rear spoiler 21 from the central portion in the vehicle width direction of inner wall portion 213 in FIGS. The other end 29b is separated from the part O by about one third of the entire length of the rear spoiler 21 to the right in FIGS.

When the vehicle mounted with the rear spoiler 21 having such a shape travels, air (running wind) flows from the inflow port 31 between the rear spoiler 21 and the rear end of the roof 4 into the air flow path 30. The air that has flowed into the air flow passage 30 forms a downward flow that flows along the rear window glass 25. The downward flow prevents foreign matter from adhering to the rear window glass 25. Further, the vortex flow generated by the air flow being cut by the rear spoiler 21 while traveling is canceled by the air flowing into the air flow path 30. For this reason, the pressure drop at the rear of the vehicle body due to the occurrence of the eddy current is reduced. This reduces the running resistance.

Further, the air flow passage 30 is configured such that the flow passage width L (flow passage area) gradually increases from the inflow port 31 toward the outflow port 32. The air pressure gradually increases, and the air flow vigorously flows from the outlet 32. Further, the air flow in the air flow path 30 flows more smoothly, the negative pressure in the air flow path 30 increases, and more air around the roof 4 and the rear spoiler 21 is taken into the air flow path 30 from the inflow port 31. . For this reason, a large amount of air can be flowed to the rear of the vehicle along the rear window glass 25, thereby reducing the negative pressure of the rear surface 28 of the vehicle and reducing wind pressure from the side of the vehicle The adhesion to 25 can be suppressed. Therefore, the cleaning effect of the rear window glass 25 can be improved. Further, since the negative pressure can be reduced, the pressure resistance due to the air added to the vehicle V can be reduced. This can also improve the fuel consumption of the vehicle.

In addition, when water droplets such as rain water flow into the air flow path 30 together with air during rainfall, the water droplets adhere to the inner wall portion 213 of the rear spoiler 21. The water droplets attached to the inner wall portion 213 flow from the lower end (vehicle rear end) 213 b of the inner wall portion 213 to the rear window glass 25. When the air flow flowing in the air flow path 30 blows off the water droplets adhering to the rear window glass 25, most of the water droplets are removed, but it is difficult to remove all the water droplets. For this reason, a water droplet which has fallen near the center of the rear window glass 25 and has not been removed may block the rear view, thereby deteriorating the rear view. In particular, when a heavy rain occurs, a large amount of water droplets from the rear spoiler 21 flow to the rear window glass 25 and the rear visibility extremely deteriorates. In this regard, in the rear spoiler device 20 according to the present embodiment, the water droplets falling from the rear spoiler 21 to the rear window glass 25 are configured not to deteriorate the rear view.

In the present embodiment, among the water droplets flowing into the air flow passage 30 and adhering to the inner wall portion 213, the water droplets adhering to the vehicle front side with respect to the groove 29 are pressure by air (running wind) flowing into the air flow passage 30. And is moved to the rear side of the vehicle and enters the groove 29 in due course. The water droplets entering the groove 29 flow along the groove 29. The rainwater that has entered the left groove 29L of the groove 29 moves along the left groove 29L and moves outward from the center in the vehicle width direction toward the left in FIG. Finally, one end 29a is reached. On the other hand, the rainwater which has entered the right side groove 29R travels to the rear of the vehicle by the traveling wind, moves along the right side groove 29R and moves outward from the center-wise part in the vehicle width direction to the right in FIG. The other end 29b is reached. One end 29a and the other end 29b of the groove 29 are located at the lower end (vehicle rear end) 213b of the inner wall 213, and the lower end (vehicle rear end) 213b of the inner wall 213 is lower It is formed to project on the Therefore, the water droplets reaching these ends 29a, 29b fall downward therefrom.

As shown in FIG. 7, the rear window glass 25 is located below the rear spoiler 21. Therefore, the water droplets dropped from the one end 29 a and the other end 29 b of the groove 29 flow down to the rear window glass 25. In the present embodiment, the position of the one end 29a of the groove 29 in the vehicle width direction and the position of the other end 29b in the vehicle width direction are far from the center of the rear spoiler 21 in the vehicle width direction. Specifically, the positions of one end 29a and the other end 29b in the vehicle width direction are separated from the center of the rear spoiler 21 in the vehicle width direction by about 1/3 of the total length, that is, left and right is there. Therefore, the water droplets dropped from these ends adhere to the vicinity of the left and right ends of the rear window glass 25. Therefore, the water droplets do not fall near the central portion of the rear window glass 25. Thus, the adhesion of water droplets near the center of the rear window glass 25 does not deteriorate the rear view.

As described above, the rear spoiler device 20 of the present embodiment is mounted at the rear portion of the roof 4 of the vehicle V and at the upper portion of the rear window glass 25 so as to form the air passage 30 at the rear portion of the vehicle V. The projection is formed to project rearward in the vehicle width direction and has a surface (inner wall portion 213) facing downward. An air flow passage 30 is formed between the inner wall portion 213 and the rear window glass 25. In the inner wall portion 213, the outflow width L2 of the outlet 32 of the air flow passage 30 is larger than the inflow width L1 of the inlet 31, and the flow passage cross-sectional area of the air flow passage 30 gradually becomes closer to the outlet 32 from the inflow 31 It is formed to be large. Further, in the inner wall portion 213, a groove 29 (guide portion) is formed. The groove 29 is inclined in the vehicle longitudinal direction with respect to the vehicle width direction, and one end 29 a extends to the lower end (vehicle rear end) 213 b of the inner wall portion 213.

According to the rear spoiler device 20 according to the present embodiment, the distance L of the air flow passage 30 formed between the rear spoiler 21 and the rear window glass 25 is gradually increased from the inflow port 31 to the outflow port 32, By increasing the negative pressure in 30, air can be easily taken into the air flow path 30 without causing an increase in air resistance. Thereby, much air taken in can be directed to the rear window glass 25, the negative pressure of the rear surface 28 of the vehicle can be reduced, adhesion of water droplets and the like due to wind entrainment and entrainment from the side of the vehicle can be suppressed, The effect can be improved. Further, since the negative pressure can be reduced, the pressure resistance due to the air applied to the vehicle can be reduced. This can also improve the fuel consumption of the vehicle.

Further, according to the present embodiment, even if water droplets adhere to the inner wall portion 213 of the rear spoiler 21, the position where the attached water droplets flow down to the rear window glass 25 is the groove 29 formed on the inner wall surface 213. It is adjusted by the position of one end 29a. Therefore, by adjusting the position of one end 29a of the groove 29 so that the water droplets fall to a position that does not deteriorate the rear visibility, the deterioration of the rear visibility due to the water droplets flowing from the rear spoiler 21 to the rear window glass 25 is suppressed be able to.

Further, the groove 29 is inclined in the vehicle longitudinal direction with respect to the vehicle width direction so as to go outward from the central portion in the vehicle width direction as going to the vehicle rear side. The positions of one end 29a and the other end 29b of the groove 29 in the vehicle width direction are separated from the central portion of the inner wall 213 of the rear spoiler 21 in the vehicle width direction by a predetermined distance. Therefore, the water droplets entering the groove 29 move away from the central portion of the inner wall 213 in the vehicle width direction as it approaches the vehicle rear end 213 b of the inner wall 213. When the water droplet reaches the lower end (vehicle rear end) 213 b of the inner wall 213, the position of the water droplet is considerably separated from the center of the inner wall 213 in the vehicle width direction. As described above, since the water droplets fall on the rear window glass 25 from a position considerably separated from the central portion of the rear spoiler 21, it is possible to more effectively suppress the deterioration of the rear view.

The second embodiment of the present invention has been described above, but the present invention is not interpreted as being limited to the second embodiment. In the second embodiment, although the example in which the groove 29 is formed as the guiding portion in the inner wall portion 213 of the rear spoiler 21 has been described, the guiding portion may be a ridge. In this case, the water droplets are guided to the lower end (vehicle rear end) 213b of the inner wall portion 213 along the ridges.

In the second embodiment, the arc-shaped groove 29 is formed in the inner wall portion 213 of the rear spoiler 21. However, as shown in FIG. 8, the linear groove 291 (or protrusion) has an inner wall. It may be formed in the part 213. Further, although both ends of the groove 29 shown in the second embodiment extend to the lower end (vehicle rear end) 213b of the inner wall portion 213, only one end is the lower end (vehicle rear end ) It may extend to 213 b. For example, as shown in FIG. 9, the first groove 292a and the second groove 292b are formed in the inner wall portion 213, and only one end of each groove is extended to the lower end (rear end) 213b. You may

Furthermore, as shown in FIG. 10, a plurality of grooves (first grooves 293a, second grooves 293b and 293b, and third grooves 293c and 293c) may be formed in the inner wall portion 213. In this case, the third grooves 293c, 293c extending to the lower end (vehicle rear end) 213b of the inner wall portion 213 correspond to the guiding portion of the present invention, and the first groove 293a and the second grooves 293b, 293b are the third. It corresponds to an auxiliary groove for causing water droplets to enter the grooves 293c, 293c. In this case, both ends of the first groove 293a overlap the ends of the second grooves 293b and 293b in the vehicle longitudinal direction, and the other ends of the second grooves 293b and 293b are third grooves 293c and 293c. It is preferable that the end portions overlap in the longitudinal direction of the vehicle. Each groove is preferably inclined in the vehicle longitudinal direction with respect to the vehicle width direction so as to go outward from the central portion in the vehicle width direction toward the vehicle rear side. According to this, the water droplets entering the first groove 293a travel along the first groove 293a to reach the end of the first groove 293a, overflow from there, move to the vehicle rear side, and enter the second groove 293b. The rainwater in the second groove 293b travels along the second groove 293b to reach the end of the second groove 293b, overflows from there, moves to the vehicle rear side, and enters the third groove 293c and enters the third groove 293c The resulting rainwater travels along the third groove 293c and reaches the end of the third groove 293c, from which water droplets are dropped to the rear window glass 25.

Further, as shown in FIG. 11, a plurality of grooves 294 a and 294 b may be concentrically formed in the inner wall portion 213. Furthermore, the grooves (or protrusions) formed in the inner wall portion 213 may be formed in line symmetry around the central portion in the vehicle width direction of the inner wall portion, or may be formed in an asymmetrical shape. Good. For example, as shown in FIG. 12, one end 295a extends to the lower end (vehicle rear end) 213b of the inner wall 213 and the other end 295b does not extend to the lower end (vehicle rear end) 213b. A groove 295 (or a ridge) of a book may be formed in the inner wall portion 213. A water droplet positioned on the vehicle front side of the groove 295 travels in the groove 295 so as to approach the center in the vehicle width direction toward the vehicle rear side. On the other hand, the water droplets located on the vehicle rear side of the groove 295 travel in the groove 295 away from the central portion in the vehicle width direction toward the vehicle rear side. Then, all the water droplets entering the groove 295 flow from one end 295 a to the rear window glass.

In the second embodiment, one end 29a of the groove 29 is about 1/3 the full length (length in the vehicle width direction) of the rear spoiler 21 from the center of the inner wall 213 in the vehicle width direction. 5 and the other end 29b is separated from the center of the inner wall 213 in the vehicle width direction by about 1/3 of the total length of the rear spoiler 21 in FIG. Shows an example. The position of one end of the groove 29 (guide portion) in the vehicle width direction is from the central portion in the vehicle width direction of the inner wall of the rear spoiler so that water droplets will not deteriorate the rear view when falling from there onto the rear window glass. It may be a position separated by a predetermined distance. In this case, the position of one end of the groove 29 (guide portion) is 1/10 of the vehicle width direction length of the rear window glass 25 from the center O in the vehicle width direction of the inner wall 213 of the rear spoiler 21. It may be a position which is separated in the vehicle width direction by the length or more. When the water drop falls to a position at which the rear window glass 25 is separated from the center in the vehicle width direction by more than this degree, the backward visibility is not significantly deteriorated. Further, in the case of a vehicle equipped with a rear wiper, in the vehicle width direction of one end portion of the groove 29 (guide portion), water droplets flow in a region outside the rear window in the vehicle width direction than the wiping range of the rear wiper. You can set the position.

Thus, the present invention can be modified without departing from the scope of the invention.

The following technical ideas can be grasped based on the contents described in the second embodiment.
(1) An inner wall portion which is an air flow path formed between the rear portion of the vehicle and facing downward and
A guide portion formed in the inner wall portion, having a groove or a ridge which is inclined in the vehicle longitudinal direction in the vehicle width direction and one end of which extends toward the vehicle rear end of the inner wall portion;
Rear spoiler device for vehicles provided with.
(2) In the vehicle rear spoiler device according to (1),
The vehicle rear spoiler device, wherein the guide portion extends to the vehicle rear end of the inner wall portion.
(3) In the vehicle rear spoiler device according to (1) or (2),
A rear spoiler device for a vehicle, wherein a position of one end of the guide in the vehicle width direction is a position separated from a central portion of the inner wall in the vehicle width direction by a predetermined distance.
(4) In the vehicle rear spoiler device according to any one of the above (1) to (3),
The vehicle rear spoiler device, wherein the guide portion is inclined in the vehicle longitudinal direction with respect to the vehicle width direction so as to go outward from a central portion in the vehicle width direction toward the vehicle rearward direction.
(5) In the vehicle rear spoiler device according to any one of the above (1) to (4),
A rear spoiler device for a vehicle, wherein the other end of the guide extends to a vehicle rear end of the inner wall.

Claims (9)

Between the rear portion of the vehicle, and a wall surface forming an air flow passage through which a part of the air flow moving backward along the roof surface of the vehicle passes as a downward flow;
An outlet end of the wall formed at the outlet of the air channel,
And an inlet-side end of the wall formed at an inlet of the air flow passage,
The outflow width, which is the distance between the wall surface at the outlet end and the rear part of the vehicle, is greater than the inflow width, which is the distance between the wall surface at the inlet end and the rear part of the vehicle Rear spoiler device for vehicles that is being enlarged. The ratio of the inflow width to the outflow width is a ratio that causes the downflow in the air flow passage to have a diffuser effect.
Vehicle rear spoiler device as described. A rear spoiler system for a vehicle according to claim 2, wherein the ratio of the inflow width to the outflow width is approximately 11:14. The rear spoiler device for a vehicle according to claim 3, further comprising: an upper surface for branching the air flow separately from the downward flow and moving it backward, and the upper surface gradually becomes lower than the roof surface as it goes rearward. The wall surface is formed with a guide portion having a groove or a ridge which is inclined in the vehicle longitudinal direction with respect to the vehicle width direction and one end thereof extends toward the vehicle rear end of the wall surface. The rear spoiler apparatus for vehicles of 1 description. The vehicle rear spoiler device according to claim 5, wherein the guide portion extends to the vehicle rear end of the wall surface. The rear spoiler device for a vehicle according to claim 5 or 6, wherein a position in the vehicle width direction of one end portion of the guide portion is a position separated by a predetermined distance from a central portion in the vehicle width direction of the wall surface. . 8. The vehicle according to claim 5, wherein the guide portion is inclined in the vehicle longitudinal direction with respect to the vehicle width direction so as to go outward from the central portion in the vehicle width direction toward the vehicle rearward direction. Rear spoiler for vehicles. 9. The vehicle rear spoiler according to any one of claims 5 to 8, wherein the other end of the guide extends to the vehicle rear end of the inner surface.

Images